Comparing judges to surgeons, imo, isn't comparable. I get what your saying and all, but I think like studies have shown, experts in their field of study become less effective because of biases.
A judge could know the law better than anyone and still hate black, brown, white or purple people.
What if the judge was super Christian and discredited muslims, 7th Day Adventists, Mormons, Satanic worshippers?
Knowing the law doesn't mean you can judge alone. That would be a really ****** world imo.
You're not gonna find that with 12 jury members.